I Built 6 Free Developer Tools for AI APIs, Cron, Docker, and Self-Hosting (opens in new tab)

I keep running into the same friction points: "How much will this prompt cost on GPT-4o vs Claude?", "What's the cron syntax for every Monday at 9am?", "Is there an open-source alternative to Notion I can self-host?" I got tired of Googling each time, so I built a set of free tools that solve these problems. No login, no API keys, no tracking — everything runs in your browser. Here's what each one does. 1. AI Prompt Cost Calculator Paste any prompt and instantly see the cost across 10 AI mode...